As Denver journalist Kyle Clark grimly observed on Monday, the 1999 Columbine High School massacre that once shocked the world when two gunmen killed 12 students and 1 teacher, has been pushed off the list of the top 10 deadliest mass shootings in recent U.S. history.

The Columbine school shooting shocked America. As of today, it is no longer one of the 10 deadliest shootings in modern US history.

One year and four months later, 64-year-old Stephen Paddock opened fire on 22,000 people at a country music festival in Las Vegas, killing 58 and injuring hundreds more. The massacre remains as the deadliest mass shooting in modern U.S. history.

Following the Las Vegas shooting, the New York Times published an interactive feature showing that in the 477 days that had passed since the Pulse nightclub shooting, there had been 521 mass shootings, and no action from Congress on tougher gun laws.